Slag agent for external refining iron and titanium removal of industrial silicon furnace

Abstract

The invention relates to a slag agent for external refining iron and titanium removal of industrial silicon, which is used for achieving the purpose of refining iron and titanium removal. The invention relates to a slag agent for removing iron and titanium in external refining of industrial silicon. The slag agent comprises the following characteristic components (in percentage by mass): 5% lt; cEOlt, CEOlt; 15%; 4% lt; caF2 < 1t >; 15%; 40% lt; siO2 < 1t >; one or two or three of Li2O, Na2O and MgF2 form a combined body, and 5% 1t of Li2O, Na2O and MgF2; the combination is lt; 25%, and satisfies Li2Olt; 10% of Na2O1t, 10% of Na2O1t; 17%, MgF2 < 1t >; 8%; 2% lt; clt; 18%; bOlt; 5%; and Fe2O3 + MNot, Fe2O3 + MNot; 1%; the balance is impurities. The slag agent disclosed by the invention is used for external refining of industrial silicon and is matched with blowing refining of a silicon ladle, so that the content of iron and titanium brought into the industrial silicon by crude fuel can be remarkably reduced on the basis of not influencing refining and dealumination, and the stability of a refining process is not influenced.

Description

technical field [0001] The invention relates to the technical field of out-of-furnace refining in industrial silicon production, in particular to a slag agent used for removing iron and titanium in out-of-furnace refining of industrial silicon, which can remove aluminum and calcium in out-of-furnace refining of industrial silicon without affecting The invention relates to removing and reducing impurity elements iron and titanium in industrial silicon, belonging to the field of industrial silicon production and refining. Background technique [0002] In the production process of industrial silicon, some impurity elements in raw materials and fuels will be reduced into industrial silicon at high temperature, mainly including calcium, aluminum, titanium, iron, phosphorus, etc. Some downstream users of industrial silicon have strict requirements on the content of the above-mentioned impurities in finished products. Therefore, at present, most active elements such as calcium and...

AI Technical Summary

Problems solved by technology

However, the reducibility of titanium is not much different from that of silicon, and the content is relatively small, so it is currently difficult to remove it by traditional oxygen blowing methods.

At the same time, since silicon is more reductive than iron, it is difficult to remove it by oxidation

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